utility function for caching form data

tests/utils/test_form_cache.py

@@ -0,0 +1,15 @@
+from werkzeug.datastructures import ImmutableDict
+
+from atst.utils.form_cache import DEFAULT_CACHE_NAME, cache_form_data, retrieve_form_data
+
+def test_cache_form_data(app):
+    data = ImmutableDict({"kessel_run": "12 parsecs"})
+    key = cache_form_data(app.redis, data)
+    assert app.redis.get("{}:{}".format(DEFAULT_CACHE_NAME, key))
+
+
+def test_retrieve_form_data(app):
+    data = ImmutableDict({"class": "corellian"})
+    key = cache_form_data(app.redis, data)
+    retrieved = retrieve_form_data(app.redis, key)
+    assert retrieved == data